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CREDIT FACILITIES AND LONG-TERM DEBT - Additional Information (Details)			1 Months Ended
	Jun. 03, 2022 CAD ($)	Jun. 02, 2022 USD ($)	Aug. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)
Non-recourse | Asset Backed Funding Vehicles
Debt Instrument [Line Items]
Notes payable issued			$ 298,100,000
Securitization Facility | Line of Credit
Debt Instrument [Line Items]
Credit facility borrowing capacity (up to)				$ 1,000,000,000
Total long-term debt outstanding				$ 350,000,000
US Bank Credit Facility | Line of Credit
Debt Instrument [Line Items]
Financing commitment amount		$ 3,750,000,000
Credit facility borrowing capacity (up to)		4,500,000,000
US Bank Credit Facility | Used vehicle floor plan | Line of Credit
Debt Instrument [Line Items]
Credit facility borrowing capacity (up to)		$ 1,000,000,000
US Bank Credit Facility | Used vehicle floor plan | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
US Bank Credit Facility | Revolving line of credit | Line of Credit
Debt Instrument [Line Items]
Credit facility borrowing capacity (up to)		$ 1,500,000,000
Option to reallocate commitment, maximum aggregate commitment threshold percentage		40.00%
Real property overall cap amount		$ 1,000,000,000
US Bank Credit Facility | New vehicle floor plan | Line of Credit
Debt Instrument [Line Items]
Credit facility borrowing capacity (up to)		$ 1,200,000,000
US Bank Credit Facility | New vehicle floor plan | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.20%
US Bank Credit Facility | Service loaner floor plan | Line of Credit
Debt Instrument [Line Items]
Credit facility borrowing capacity (up to)		$ 50,000,000
Option to reallocate commitment, maximum aggregate commitment threshold percentage		3.00%
US Bank Credit Facility | Service loaner floor plan | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.30%
US Bank Credit Facility | Working capital revolver | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.10%
Bank Of Nova Scotia Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Credit facility borrowing capacity (up to)	$ 1,125,000,000
Bank Of Nova Scotia Credit Agreement | Line of Credit | Minimum | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.25%
Bank Of Nova Scotia Credit Agreement | Line of Credit | Minimum | Canadian Dollar Offered Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.25%
Bank Of Nova Scotia Credit Agreement | Line of Credit | Maximum | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.30%
Bank Of Nova Scotia Credit Agreement | Line of Credit | Maximum | Canadian Dollar Offered Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.30%
Bank Of Nova Scotia Credit Agreement | Working Capital And General Corporate Purposes Financing | Line of Credit
Debt Instrument [Line Items]
Credit facility borrowing capacity (up to)	$ 100,000,000
Bank Of Nova Scotia Credit Agreement | Wholesale Flooring Facility | Line of Credit
Debt Instrument [Line Items]
Credit facility borrowing capacity (up to)	500,000,000
Maximum borrowing capacity, accordion feature	200,000,000
Bank Of Nova Scotia Credit Agreement | Used Motor Vehicles For Sale In Canada And For Export To United States | Line of Credit
Debt Instrument [Line Items]
Credit facility borrowing capacity (up to)	100,000,000
Bank Of Nova Scotia Credit Agreement | Wholesale Lease Financing | Line of Credit
Debt Instrument [Line Items]
Credit facility borrowing capacity (up to)	400,000,000
Bank Of Nova Scotia Credit Agreement | Motor Vehicle Leases | Line of Credit
Debt Instrument [Line Items]
Credit facility borrowing capacity (up to)	25,000,000
Bank Of Nova Scotia Credit Agreement | Financing Under Other Canadian Facilities | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity, accordion feature	$ 200,000,000

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